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Found 5 results

  1. In the Channel Mixer, you can select a single channel by choosing a colour model and zeroing the unwanted channels. eg. for red channel, use RGB model, select to Greens and zero Green, then select Blues and zero Blue. I can do this for RGB and CMYK. But in LAB, if I zero AOpponent and BOpponent I'm getting a blue/cyan result. What am I doing wrong? Should it not be b/w? ps. I can separate channels by changing document colour model and clearing in the Channels panel, but I'd just like to be able to do it in Channel Mixer.
  2. There is a repeating wish that people would like to use the full scale of editing tools on masks, and handle them as grayscale layers. They are usually told that masks only have the alpha channel, and they are mistaken to think that values of alpha are considered shades of gray. I think this is not the full story. One can use a regular pixel layer as mask, and the alpha channel (transparency) of the pixel layer will be used for masking, while ignoring the RGB channels of it. Furthermore it is possible to put a live Channel mixer adjustment on top of a pixel layer which makes it transparent based on it's luminosity. Combine these two tricks, you get a mask, where you can do every aspect of grayscale editing. Here are the steps: You have pixel layer A you would like to mask, and pixel layer M you would like to use as mask. You nest a Channel Mixer adjustment inside M, choose LAB channels, Alpha channel, make contribution of input Alpha 0, and contribution of input Lightness 100% into Alpha. Layer M should be above layer A. Right-click layer M, and choose Mask to Below. Bam, you have a mask pixel layer to do any edits and it's luminosity is used for masking. (beware of a GUI limitation that nested children of masks are not shown on the layers panel) What do you think?
  3. I'm trying to figure out how the channel mixer adjustment works. Could someone point me towards some tutorials that deal with this specifically? I've tried playing around with it on various images, but remain puzzled by how it produces the effects I've seen.
  4. In dynamic adjustments such as Gradient Map and Channel Mixer, you can 'Add Preset' but curiously, you can't Load it (you have to go to the Adjustments tab). This seems an odd omission. It would help also if you could 'Export' and 'Import' them to files so they could be shared. Thanks for watching (and, hopefully, implementing).
  5. I'd love to see a the following additions and fixes to the Channel Mixer feature: Ability to output to Grayscale from RGB. Currently, this is a bit cumbersome since it requires the user to set identical slider settings for 3 different channels (R, G, and B). The current Grayscale setting is only of rather limited use since it only supports Gray and Alpha as input channels. Access to "Spare Channels" as Affinity calls them. Ideally, these would show up in the Channel Mixer as additional sliders. An "Auto Normalize" checkbox. While sometimes a change in output luminosity is desired, I often find myself unnecessarily wasting time trying to manually normalize the output using the sliders once I'm theoretically happy with my balance. Use an NSSegmentedControl or similar instead of a popup for selecting the current channel (goes for multiple place in the UI). The popup requires an unnecessary additional click every time the user wants to switch between channels. When typing a value into an edit box and then switching channel without changing focus to another input field first, the value that was typed in is currently discarded and not applied.
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